this is my thought...

Battery sit parallel to the dog bones won't make the car balance cuz the motor sit on one side will affect the car while drift left or right( unless motor is one side and esc+receiver on 1 side)
Battery sit parallel to the belt( or shaft) will balance out the car. that means motor+ esc+reciever one 1 side and battery on the other side.
I dun think both situations will affect your drift though, but since u want to know detail different so yeah...
Correct me if im wrong pls